Heat conductive silicone grease composition and preparation method thereof

A heat-conducting silicone grease and composition technology, which is applied in the field of heat-conducting silicone grease composition and its preparation, can solve the problems of heat-conducting silicone grease losing uniformity, heat-conducting function, density difference, poor compatibility, and complicated processing technology, etc. Achieve the effects of simple preparation method, improved lipophilicity and good application prospects

Inactive Publication Date: 2017-03-22
SHENZHEN ANPIN SILICONE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to obtain good thermal conductivity, thermally conductive silicone grease usually contains a certain proportion of thermally conductive fillers, but due to the density difference and poor compatibility between the base silicone oil and the thermally conductive filler, the thermally conductive silicone grease will cause oil out after a period of use , that is, the basic silicone oil and the heat-conducting powder are separated, deposited, and layered, so that the heat-conducting silicone grease will eventually lose its uniformity and heat-conducting function
At present, powder surface treatment is the main technical means to improve the compatibility between the basic silicone oil and the thermally conductive filler, improve the stability of the system, and reduce the oil output, but there are defects of high cost and complicated treatment process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In the thermally conductive silicone grease composition, the basic silicone oil is methyl silicone oil with a viscosity of 100mpa s at 25°C; the thermally conductive filler is α-spherical alumina with an average particle size of 15μm; It is 70mpa·s, the hydrogen content is 0.2% (mass percentage), and the coupling agent is γ-aminopropyltriethoxysilane.

[0039] The preparation method of heat-conducting silicone grease comprises the following steps: mix and stir the base silicone oil, oil-inhibiting additive, and coupling agent for 5 minutes according to the stated parts, add the heat-conducting filler in 3 times, stir at 30°C for 1 hour to obtain a mixture, and mix the mixture Grind in a three-roll mill at 40°C for 2 times until the fineness is 20 μm to obtain thermal conductive silicone grease. The test method for fineness refers to the method standard: JJG (Chemical) 018-96" Scraper Fineness Meter" and its GB / T1724-93 standard.

Embodiment 2

[0041] In the heat-conducting silicone grease composition, the base silicone oil is methyl silicone oil with a viscosity of 500mpa·s at 25°C; the heat-conducting filler is zinc oxide with an average particle size of 2 μm and aluminum nitride of 10 μm mixed in a mass ratio of 1:3; oil-suppressing additive It is methyl hydrogen silicone oil, the viscosity at 25°C is 150mpa·s, the hydrogen content is 0.3% (mass percentage), and the coupling agent is hexamethyldisilazane.

[0042] The preparation method of heat-conducting silicone grease includes the following steps: mix and stir the base silicone oil, oil-inhibiting additive and coupling agent for 8 minutes according to the stated parts, add heat-conducting filler in 2 times, stir at 30°C for 1.5 hours to obtain the mixture, and mix The mixture was ground 3 times in a three-roll mill at 50°C until the fineness was 15 μm to obtain thermal conductive silicone grease. The test method for fineness refers to the method standard: JJG (C...

Embodiment 3

[0044] In the thermally conductive silicone grease composition, the base silicone oil is methyl silicone oil with a viscosity of 1200mpa s at 25°C; the thermally conductive filler is boron nitride with an average particle size of 0.8 μm and 5 μm aluminum hydroxide and 10 μm aluminum oxide in a mass ratio of 1: 5:14 mixing; the oil-suppressing additive is hydrogen-containing methyl silicone oil, the viscosity at 25°C is 1000mpa·s, and the hydrogen content is 0.4% (mass percentage).

[0045]The preparation method of heat-conducting silicone grease comprises the following steps: mix and stir the base silicone oil and the oil-suppressing additive for 10 minutes according to the stated parts, add the heat-conducting filler in 3 times, stir at 40°C for 2 hours to obtain a mixture, and place the mixture at 60°C in Grind twice in a three-roll mill until the fineness is 20 μm to obtain thermal conductive silicone grease. The test method for fineness refers to the method standard: JJG (C...

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Abstract

The invention discloses a heat conductive silicone grease composition and a preparation method thereof. The heat conductive silicone grease composition includes (A) base silicone oil, which is linear organopolysiloxane, has a monovalent hydrocarbonyl group having 1-18 carbon atoms and bonded with silicon in the molecular structure, and has a kinematic viscosity of 50-1500mpa.s at 25DEG C; (B) a heat conductive filler, which has hydroxyl on the surface; and (C) an oil suppression additive, which is organopolysiloxane containing a hydrogen group connected to silicon, and has a kinematic viscosity of 10-1500mpa.s at 25DEG C. The heat conductive silicone grease prepared from the composition provided by the invention has the characteristics of high heat conduction coefficient, good insulation performance and low oil yield, and can effectively improve the use reliability of heat conductive silicone grease.

Description

technical field [0001] The invention belongs to the technical field of organic silicon materials, and relates to a heat-conducting silicone grease composition and a preparation method thereof. [0002] technical background [0003] In the miniaturization and ultra-thin design of equipment, heat transfer, sealing, and insulation between heat-generating parts and heat-dissipating parts are one of the key factors to be considered. Thermally conductive silicone grease, commonly known as heat dissipation paste, is a thermally conductive silicone grease compound made of basic silicone oil as the main raw material and materials with excellent heat resistance and thermal conductivity. It is used for electronic components such as power amplifiers, transistors, electron tubes, and CPUs. Excellent heat conduction and heat dissipation, so as to ensure the stability of the electrical performance of electronic instruments and meters. [0004] Thermally conductive silicone grease is a kind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08L83/05C08K7/18C08K3/22C08K5/544C08K3/28C08K5/5445C09K5/14
CPCC08L83/04C08K2201/003C08K2201/014C08L2205/025C09K5/14C08K7/18C08K2003/2227C08K5/544C08K2003/2296C08K2003/282
Inventor 张耀湘李云张宇强何文君覃剑喻春莲
Owner SHENZHEN ANPIN SILICONE MATERIAL
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